This is the Mounting Base for our HD T-Bars, in the event that you want to mount your T-Bar somewhere else on your boat.  Now, just remove the two 3/8" bolts, that came with your T-Bar Kit, and move it to the next mounting position.
 
What's included:
Mounting Base
Bottom Plate
4x 1/4-20 screws, 4x 1/4" locking washers, and 4x 1/4-20 hex nuts